PM_2.5 induced neurodegenerative-like changes in mice and the antagonistic effects of vitamin E

Area of Science:

• Environmental Health
• Neuroscience
• Toxicology

Background:

• Neurodegenerative diseases (ND) pose a significant global health challenge, with genetic factors alone insufficient to explain their pathogenesis.
• Environmental factors and lifestyle choices are increasingly recognized as contributors to ND development.
• Particulate matter (PM2.5) exposure is a potential environmental risk factor for ND, but underlying mechanisms require further investigation.

Purpose of the Study:

• To investigate the in vivo effects of PM2.5 exposure on the brain and explore potential molecular mechanisms.
• To assess whether vitamin E (Vit E) can mitigate PM2.5-induced neurotoxicity.

Main Methods:

• C57BL/6J mice were exposed to PM2.5 daily for one week.
• Neurobehavioral tests were conducted to evaluate cognitive function.
• Histopathological examination of brain tissue was performed to detect neuronal loss and protein aggregates.
• Biochemical assays were used to assess oxidative stress and inflammation markers.
• The protective effects of concurrent vitamin E administration were evaluated.

Main Results:

• Acute PM2.5 exposure induced cognitive deficits, neuronal loss, and protein aggregates in mouse brains, indicative of ND-like changes.
• Evidence suggests that oxidative stress and inflammation are involved in PM2.5-induced neurotoxicity.
• Concurrent administration of vitamin E significantly blocked the observed PM2.5-induced brain damage and associated pathologies.

Conclusions:

• PM2.5 exposure can trigger neurodegenerative disease-like alterations in the brain through oxidative stress and inflammation.
• Vitamin E demonstrates a protective effect against PM2.5 neurotoxicity, likely via its antioxidant and anti-inflammatory properties.
• These findings highlight the potential role of air pollution in neurodegeneration and suggest therapeutic avenues for mitigation.